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282 pages, ebook
First published September 28, 2004
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By then, the Milky Way will have coalesced with its nearest neighbors, creating one giant galaxy in the literal middle of nowhere. Our night sky will contain orbiting stars, (dead and alive) and nothing else, leaving future astrophysicists a cruel universe....Enjoy cosmology while you can.Another humorous digression starts out by mentioning that lithium has been useful as an antidepressant medication:
Lithium rides down a one-way street because every star has more effective nuclear fusion reactions to destroy lithium than to create it. As a result, the cosmic supply of lithium has steadily decreased and continues to do so. If you want some, now would be a good time to acquire it.I also very much appreciated the mention of Alar and Juri Toomre, two brothers who simulated the effects of colliding galaxies. As a graduate student, I took a few excellent classes from Juri Toomre. And I remember a seminar that he gave on the subject of galaxies colliding! It's nice to encounter a professor who was influential in my life, mentioned in a popular book such as this one.
“However, every advance in our knowledge of the cosmos has revealed that we live on a cosmic speck of dust, orbiting a mediocre star in the far suburbs of a common sort of galaxy, among a hundred billion galaxies in the universe. The news of our cosmic unimportance triggers impressive defense mechanisms in the human psyche.”
“... informed ignorance provides the natural state of mind for research scientists at the ever-shifting frontiers of knowledge. People who believe themselves ignorant of nothing have neither looked for, nor stumbled upon, the boundary between what is known and unknown in the cosmos.”
“In the beginning, there was physics.”
We shall not cease from exploration
And the end of all our exploring
Will be to arrive where we started
And know the place for the first time . . .
-- T. S. Eliot, 1942
Hardly any scientific discoveries of the past century have flowed from the direct application of our senses. They came instead from the direct application of the sense-transcendent mathematics and hardware. This simple fact explains why, to the average person, relativity, particle physics, and eleven-dimensional string theory make no sense. Add to this list black holes, wormholes, and the big bang.
-- Neil deGrasse Tyson, from Origins